蝴蝶的生命周期包括卵、幼虫、蛹和成虫阶段。

The life ___cycle of a butterfly includes egg, caterpillar, pupa, and adult stages.

许多自然过程，如水循环，对地球上的生命至关重要。

Many natural processes, like the water ___cycle, are essential for life on Earth.

公司遵循一个每年重复的严格预算周期。

The company operates on a strict budget ___cycle that repeats every fiscal year.